Arc-lamp.



W. RUHLING.

-ARoLAMR APPLICATION FILED MAY l1, 1911,

Patented J an. 7', 1913,

WALDEMAR RHLING, OF BERLIN, GERMANY.

ARC-LAMP.

Specification of Letters Patent.

Application led May 11, 1911.

Patented Jan.. 7, 1913.

Serial No. 626,412.

T0 all whom it may Concern:

Be it known that I, VVALDEMAR RHLrNo, a subject of the King` of Prussia,and residing at Berlin, Germany, have invented a certain new andImproved Arc-Lamp, of which the following is a specification.

The present invention relates to arc lamps of the candle type, thespecial object of my invention being to improve the same in the detailshereinafter mentioned.

In'the accompanying drawings a lamp of this type isl shown in sideelevation.

As is well understood in lamps of this type there is no mechanical feedor regulating device for starting and maintaining the arc, but theelectrodes are arranged in parallel and insulated from. each other by aninterposed non-conducting barrier. I have previously proposed toprovi-de a barrier of this character containing metal and a carbonaceousmaterial which are fused during the operation of the lamp in proximityto the arc and, upon the extinction of the arc, forni a conductingbridge extending between the electrodes which is consumed upon switchingin of the current 'again and thus serves to automatically start thearc.H the barrier comprise for example graphite, gyp-,

sum and metal, these are fused by the arc and form, upon the extinctionof the lamp, a rigid mass at the top of the unconsumed portion of thebarrier. It appears that this mass forms a diiiicultly fusible slagwhich works out upon the ends of the electrodes arc such slag as maytend and interferes with the formation of a perfectly normal arc, andfurthermore through its obscuring action, lessens the lighting capacit-yand thus the efiiciency of the lamp. To overcome this disadvantagdl nowpropose to add to the non-conducting barrier,

a suitable HuX such as cryolite, asbestos powder, or barytes. Theaddition of this flux prevents the formation of the slag by rendering itvolatile in the presence ot' the arc and thus not only is the burningaway of the barrier :facilita-ted, but the electrode ends now projectclear of the slag and barrier, the arc-is formed without impediment and'the `full capacity of the lamp secured.

Upon extinction ot' the arc it is found thatstartthe lamp, .is formedalong the upper edges on each side of the barrier.

Various fluxes may be employed and I do noti limit ,myself to thosementioned.

I claim as my invention n an arc lamp of the character described, aninsulating barrier comprising a flux serving to render volatile in thepresence of the to form during the operation of the lamp.-

In'testimony whereof I have signed my name to this speciication, in thepresence of two subscribing witnesses.

WALDEMAR RUHLING.

Witnesses:

HENRY HASPER, RICHARD Gon'rz.

